Shoppersstop.com — Wrong product received. Not processing refund

Address: Shoppers Stop, Mumbai, India

I had made an online purchase of Estelle Womens Gold Plated Timeless Solitaire Diamond Pendant under order id:[protected] on 14th Feb 2022

I received a wrong product which I promptly returned mentioning that I had received a wrong product. For a very long time I did not receive a refund for the product. Every time I call them, they say that their QC team is checking the product. After many folowups I raised a complaint Shopper Stop Support- CAS[protected]Q4P8S6 CRM:00012583

After which I received their email stating that I had sent them a fake product.
I had only returned the wrong product which ShoppersStop had sent me, which they are terming it as fake.

I have attached the photo of the product which I had ordered, The wrong product that they sent and the copy of their email stating that the returned product is fake.
Request you to kindly take this up with the relevant authority.
Thanks,
Venugopal
[protected]@yahoo.com